4 files changed, 61 insertions, 0 deletions
diff --git a/3665/CH9/EX9.1/Ex9_1.sce b/3665/CH9/EX9.1/Ex9_1.sce
new file mode 100644
index 000000000..b0c8005eb
--- /dev/null
+++ b/3665/CH9/EX9.1/Ex9_1.sce
@@ -0,0 +1,14 @@
+clc//
+//
+//
+
+//Variable declaration
+h=6.62*10^-34;     //planck's constant(J sec)
+c=3*10^8;     //velocity of light(m/sec)
+Eg=1.43*1.6*10^-19;    //energy gap(J)
+
+//Calculation
+lamda=h*c*10^6/Eg;    //wavelength of radiation(micro m)
+
+//Result
+printf("\n wavelength of radiation is %0.3f micro m",lamda)
diff --git a/3665/CH9/EX9.2/Ex9_2.sce b/3665/CH9/EX9.2/Ex9_2.sce
new file mode 100644
index 000000000..82aaf5c20
--- /dev/null
+++ b/3665/CH9/EX9.2/Ex9_2.sce
@@ -0,0 +1,13 @@
+clc//
+//
+//
+
+//Variable declaration
+d=5*10^-6;     //thickness(m)
+Dc=3.4*10^-3;    //diffusion coefficient(m^2 S-1)
+
+//Calculation
+tow_diff=d^2/(2*Dc);     //time taken(s)
+
+//Result
+printf("\n time taken is %0.1f *10^-9 s",tow_diff*10^9)
diff --git a/3665/CH9/EX9.3/Ex9_3.sce b/3665/CH9/EX9.3/Ex9_3.sce
new file mode 100644
index 000000000..d95d9dafa
--- /dev/null
+++ b/3665/CH9/EX9.3/Ex9_3.sce
@@ -0,0 +1,13 @@
+clc//
+//
+//
+
+//Variable declaration
+w=5*10^-6;     //thickness(m)
+vsat=10^5;     //velocity(m/s)
+
+//Calculation
+tow_drift=w/vsat;     //transit time(s)
+
+//Result
+printf("\n transit time is %0.3f s",tow_drift)
diff --git a/3665/CH9/EX9.4/Ex9_4.sce b/3665/CH9/EX9.4/Ex9_4.sce
new file mode 100644
index 000000000..6a4064a33
--- /dev/null
+++ b/3665/CH9/EX9.4/Ex9_4.sce
@@ -0,0 +1,21 @@
+clc//
+//
+//
+
+//Variable declaration
+A=10^-6;     //area(m^2)
+e=1.6*10^-19;     //charge(coulomb)
+Nd=10^21;     //electron concentration(m^-3)
+epsilonr=11.7;
+epsilon0=8.85*10^-12;
+V=10;    //potential(V)
+RL=50;   //resistance(ohm)
+
+//Calculation
+Cj=(A/2)*sqrt(2*e*epsilonr*epsilon0*Nd/V);      //diode capacitance(F)
+delta_fel=1/(2*%pi*RL*Cj);    //frequency bandwidth(Hz)
+
+//Result
+printf("\n diode capacitance is %0.1f pF",Cj*10^12)
+printf("\n frequency bandwidth is %0.0f MHz",delta_fel*10^-6)
+printf("\n answer varies due to rounding off errors")